If statement for matrix

I have a matrix of 73 rows andd 12 columns having different values to each cell. I want to assign if cell value=0.5 display "0, else if cell value >=0.5 display "+1" else cell value<=0.5 display "-1". I tried following, but gives only one value.1,1 cell value is -0.5438.

if B==0.5;

disp='0';

elseif B>=0.5;

disp='+1';

else

disp='-1'

end

Answer 1

[DGM]

If you want to change array values, why are you using disp()?

This will produce the output of the same size:

A = rand(4,3); % a test array
A(1) = 0.5 % make sure at least one is exactly 0.5

A = 4×3

0.5000 0.4352 0.4317 0.2511 0.4596 0.8072 0.9170 0.0056 0.6738 0.1956 0.2177 0.4465

B = sign(A-0.5) % simple numeric output

B = 4×3

0 -1 -1 -1 -1 1 1 -1 1 -1 -1 -1

If for some reason, you want a bunch of text output:

cmap = {'-1','0','+1'};
Btext = cmap(sign(A-0.5)+2) % cellchar output

Btext = 4×3 cell array
    {'0' }    {'-1'}    {'-1'}
    {'-1'}    {'-1'}    {'+1'}
    {'+1'}    {'-1'}    {'+1'}
    {'-1'}    {'-1'}    {'-1'}